Riverwalker... That is the million dollar question, and the one that always makes me question a number of the responders to threads in this forum where their first response is to draw their weapon.
Legally, he could be charged with brandishing and lose his CCW permit, if he did fire it is likely assault with. Deadly weapon, particularly if Mr. Loudmouth was unarmed.
Personally, I think his deescalation. Of the threat was the only possible solution at this point.